---
product_id: 48226688
title: "Fluval Cycle Water Treatment, 500 ml"
brand: "fluval"
price: "R1040"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.co.za/products/48226688-fluval-cycle-water-treatment-500-ml
store_origin: ZA
region: South Africa
---

# Immediate ammonia & nitrite neutralization Safe for fresh & saltwater 500 ml liquid formula Fluval Cycle Water Treatment, 500 ml

**Brand:** fluval
**Price:** R1040
**Availability:** ✅ In Stock

## Summary

> 💧 Transform your tank into a thriving aquatic haven—fast, safe, and foolproof!

## Quick Answers

- **What is this?** Fluval Cycle Water Treatment, 500 ml by fluval
- **How much does it cost?** R1040 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/48226688-fluval-cycle-water-treatment-500-ml)

## Best For

- fluval enthusiasts

## Why This Product

- Trusted fluval brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted by Thousands:** Join 6,500+ happy aquarists who rely on Fluval Cycle for crystal-clear, healthy water.
- • **Instantly Safe Aquarium:** Kickstart your tank’s nitrogen cycle with rapid bacteria activation for a healthy aquatic ecosystem.
- • **Stress-Free Fish Introduction:** Add fish immediately without waiting, thanks to safe water conditioning.
- • **Universal Fresh & Saltwater Use:** One treatment fits all—perfect for diverse aquarium setups.
- • **Powerful Ammonia & Nitrite Control:** Eliminate toxic spikes fast to protect your fish and prevent costly losses.

## Overview

Fluval Cycle Water Treatment (500 ml) is a scientifically formulated liquid that jumpstarts the biological filtration in both fresh and saltwater aquariums. It rapidly eliminates harmful ammonia and nitrite, enabling immediate fish introduction and preventing fish loss. Trusted by thousands, it ensures a stable, healthy environment for your aquatic pets with every dose.

## Description

Free delivery and returns on eligible orders. Buy Fluval Cycle Water Treatment, 500 ml at desertcart UK.

Review: Maintain a healthy Aquarium - I use this product when setting up a new aquarium (as part of the nitrogen cycle to promote healthy ammonia eating bacteria growth, a 6 to 8 week process) and as part of my weekly water changes. I feel that this product works very well, as my fish are all happy and healthy and I have never experienced any bad water quality issues (ammonia spikes etc). I use this weekly to add to my 200ltr, 60ltr and 30ltr aquariums when I do a water change. I change 20% - 30% of the water volume and add an appropriate dose of this stuff, however it's not really possible to overdose so it does not really matter if you add a little bit extra. I usually do add a bit more than stated on the label. I keep it stored at room temperature and the 2ltr bottle usually lasts me about 6 weeks. There is always a seal covering the opening after the lid has been unscrewed, so you know it is brand new and has not been opened / tampered with. This is safe for my fresh water aquarium inhabitants, of which I have many varieties. Pros: - The larger 2ltr bottle is excellent value compared to the 250ml or 500ml bottles - Quick delivery / repeat orders available - Far cheaper than my local pet store Cons: - Nothing I can think of really I hope this review has been helpful to you. Happy Fish Keeping!
Review: Good - Does exactly as it says on the tin or bottle!!! Definitely a must have for the health of your fish to get the chlorine out of tap water and help control ammonia.

## Features

- Immediately establishes safe biological aquarium environment
- Powerful responsive ammonia and nitrite elimination
- Prevents fish loss
- Allows immediate introduction of fish
- For Fresh and Saltwater Use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00G25IAN6 |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 2,262 in Pet Supplies ( See Top 100 in Pet Supplies ) 19 in Aquarium Water Treatments |
| Colour | Blue |
| Customer Reviews | 4.6 4.6 out of 5 stars (6,536) |
| Date First Available | 6 Jan. 2014 |
| Item Form | Liquid |
| Item Weight | 513 g |
| Item model number | A8351A1 |
| Number of Items | 1 |
| Pet Type | Fish |
| Product Dimensions | 7.62 x 7.62 x 16.51 cm; 513 g |
| Quantity | 1 |
| Size | 500 ml |
| Volume | 500 Millilitres |

## Product Details

- **Brand:** Fluval
- **Item form:** Liquid
- **Liquid volume:** 16.9 Fluid Ounces
- **Manufacturer:** Rolf C Hagen UK Ltd
- **Pet Type:** Fish

## Images

![Fluval Cycle Water Treatment, 500 ml - Image 1](https://m.media-amazon.com/images/I/71qzj+FGElL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: i have a 240l tank how much cycle do i use in my tank it is a new tank.**
A: Tip the whole bottle in your filter

**Q: Can this be used to boost some established bio media in a new tank?**
A: Yes definately. Put it in the tank as instructions say. Then keep putting a min og 10 ml in until your happy. I used it for setting up new 200 ltr tank and it's the only stuff I used after that.

**Q: Can I use this in salt water?**
A: Having read the information on the back of the bottle it says that it is safe for use in fresh and salt water aquariums.

**Q: I want to add new fish into my established tank. Can I add this into the tank, let the bag with new fish float for a while then release the fish?**
A: No! What you must do is add this after following the instructions and leave for a few days for the bacteria to establish a proper environment for the fish before they are added. Try reading a book or 3 on setting up a fish tank.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Maintain a healthy Aquarium
*by M***D on 3 April 2021*

I use this product when setting up a new aquarium (as part of the nitrogen cycle to promote healthy ammonia eating bacteria growth, a 6 to 8 week process) and as part of my weekly water changes. I feel that this product works very well, as my fish are all happy and healthy and I have never experienced any bad water quality issues (ammonia spikes etc). I use this weekly to add to my 200ltr, 60ltr and 30ltr aquariums when I do a water change. I change 20% - 30% of the water volume and add an appropriate dose of this stuff, however it's not really possible to overdose so it does not really matter if you add a little bit extra. I usually do add a bit more than stated on the label. I keep it stored at room temperature and the 2ltr bottle usually lasts me about 6 weeks. There is always a seal covering the opening after the lid has been unscrewed, so you know it is brand new and has not been opened / tampered with. This is safe for my fresh water aquarium inhabitants, of which I have many varieties. Pros: - The larger 2ltr bottle is excellent value compared to the 250ml or 500ml bottles - Quick delivery / repeat orders available - Far cheaper than my local pet store Cons: - Nothing I can think of really I hope this review has been helpful to you. Happy Fish Keeping!

### ⭐⭐⭐⭐⭐ Good
*by P***L on 3 May 2025*

Does exactly as it says on the tin or bottle!!! Definitely a must have for the health of your fish to get the chlorine out of tap water and help control ammonia.

### ⭐⭐⭐⭐⭐ Used for years.great product.
*by J***N on 19 November 2025*

Does what it says.

## Frequently Bought Together

- Fluval Cycle Biological Enhancer, Aquarium Water Treatment, 16.9 Oz., A8351
- Fluval Waste Control Biological Cleaner, Aquarium Water Treatment, 8.4 Oz., A8355
- Fluval AquaPlus Water Conditioner, Aquarium Water Treatment, 16.9 Oz., A8344

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.za/products/48226688-fluval-cycle-water-treatment-500-ml](https://www.desertcart.co.za/products/48226688-fluval-cycle-water-treatment-500-ml)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-21*